I could never get the debit card option to work for me with WU, and just gave up trying, using the bank transfer option that usually takes 8 days, but sometimes only 2 or 3 and once even the next day. So I just lived with the 8 day transfer. Of course, an unexpected expense came up and I wanted the money faster, so taking Caribbean Cool's advice, I created a new WU account, put in all the bank and debit card info, and then it got to the CONTINUE button and nothing would make it go past this and continue to the next REVIEW screen. Then I tried using the phone app, thinking it was a problem with Chrome on a PC (I also tried MicroSoft's Edge, still wouldn't go past CONTINUE when I clicked the button!) but it wouldn't complete with the phone app either. Then I went back to Chrome, relogged in, and the debit card option worked, but the card was declined and it said to use a different card, hmmmpth!. I got an email from CitiBank that asked if the transfer amount was valid, I clicked on YES and it said to go ahead and try the transfer again, then I used my McAfee VPN and set my PC to the USA. Logged back in using Chrome and then WU finally transferred using my debit card.
Since it was a first transfer the transfer fee was waved, but I've been using the Chrome extension from
https://capitaloneshopping.com/ and have been getting discounts and only paying $5.00 USA transfers from WU for almost 2 years. The extension is a little annoying as it pops up when you're on commercial websites, but it's worth the annoyance for getting discounts at WU.
FYI, I also tried creating an account on (
https://www.taptapsend.com/) that Filipo mentioned, but they suspended my account on the first transfer attempt, and after chatting with them and giving them all my documents proving it's me, and my bank accounts, they said they'd get back to me soon, it's been over a week and I've sent them a follow-up email, but no reply.